Hv-SOI LDMOS device with integrated diode to improve reliability and avalanche ruggedness
A diode and device technology, applied in the field of lateral drift metal oxide semiconductor devices, can solve problems such as destroying devices and semiconductor device breakdown
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[0018] The motivation for the present invention comes from a simple idea. If a power transistor can be severely damaged by bipolar secondary breakdown, it is necessary to avoid such breakdown and to suppress and control any overvoltage breakdown. Since an avalanche in a diode does not cause bipolar secondary breakdown, we incorporate a diode structure into a transistor device and fabricate it to have a lower breakdown voltage than a transistor. Therefore, any breakdown is limited to the diode device, making the entire transistor more robust and reliable. Think of the diode region as a shock absorber or a lighting rod for transient current or voltage spikes, allowing avalanche breakdown to occur there. They absorb excess voltage and protect transistors from damage. It is easy to change the transistor structure into a diode structure by simply removing the source region of the transistor structure. Therefore, to make the integrated device, only a simple modification of the tr...
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